ENGINE 3-29
• Insert the solid pilot 1 (09916-24450: N-100-5.52) with a slight
rotation. Seat the pilot snugly. Install the 45° cutter, attachment
and T-handle.
INITIAL SEAT CUT
• Using the 45° cutter, descale and clean up the seat. Rotate the
cutter one or two turns.
• Measure the valve seat width W after every cut.
• If the valve seat is pitted or burned, use the 45° cutter to condi-
tion the seat some more.
NOTE:
Cut only the minimum amount necessary from the seat to pre-
vent the possibility of the valve stem becoming too close to the
camshaft.
TOP NARROWING CUT
• If the contact area W is too high on the valve, or if it is too wide,
use the 15° (for the exhaust side) and the 30° (for the intake
side) to lower and narrow the contact area.
15˚ (Exhaust)
30˚ (Intake)
Contact area too high and too
wide on face of valve
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